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The vortex flow meter is a new type of flow meter developed based on the Karman vortex street principle; it is primarily used for measuring the flow rate of fluids in industrial pipelines, including various media such as gases, liquids, and vapors. It is characterized by low pressure loss, a wide measurement range, and high accuracy; when measuring volumetric flow rate under operating conditions, it is hardly affected by parameters such as fluid density, pressure, temperature, and viscosity. Because vortex flowmeters possess advantages that other flowmeters do not, they have seen rapid development since their introduction. According to statistics, in developed countries such as Japan, Europe, and the United States, the use of vortex flowmeters has increased significantly, and they are now widely used in various fields. Based on this trend, vortex flowmeters will play a dominant role in flow meters in the future. Manufacturers of vortex flowmeters first introduce the advantages of these devices: 1. They have a simple and robust structure, with no moving parts, making them highly reliable for long-term use ； 2. It is very easy to maintain, with low installation costs ； 3. The sensor does not come into direct contact with the medium, ensuring stable performance and a long service life ； 4. Outputs pulse signals proportional to flow rate, with no zero drift, high precision, and easy integration with computers ； 5. Wide measurement range, with a range ratio of up to 1:10 ； 6. Low pressure loss and low operating costs, making it more energy-efficient ； 7. Within a certain range of Reynolds numbers, the frequency of the output signal is not affected by the physical properties or composition of the fluid; the instrument coefficient depends only on the shape and size of the vortex generator. No compensation is required to measure the volumetric flow rate of the fluid, and there is no need to recalibrate the instrument’s coefficients after replacing the components ； 8. Wide range of applications; capable of measuring the flow rate of both gases and liquids ； 9. The calibration cycle is 2 to 4 years.